First answer : equilibriumshift towards the formation of the reactants
Second answer : equilibrium shift towards the formation of products
Third answer : need to add more H2O.
Explanation:
In a reversible chemical reaction, the shift of equilibrium of the reaction towards the production of products or reactants is dependent on the abundance of reactants or products.
As in the first question, if the products available are more (C) than the reactants, then the equilibrium of the reaction would shift towards the formation of the reactants (A and B).
As in second question, If reactants available are more (heat addition) than that of products, then the equilibrium of the reaction would shift towards the formation of products (D).
As in the third question, we want to generate more HCL, which is the reactant, so we need to increase the amount of product, so we need to add more H2O.